Process of duplicating phonograms.



F. W. MATTHEWS.

PROCESS or DUPLIGATING PHONOGRAMS.

APPLICATION FILED AUG. 16, 1909.

,zwk 0mm Inventor:

Aity

- Times, a citizen of the United UNiTED STATES rATENT ora ion...

FREDERICK W. MATTHEWS,

OF NEW YORK, N/Y.

PROCESS OF DUPLICATING PHONOGRAMS.

To all whom it may concern:

Be it known that I, Fiucnnmcx W. Mar- States, residing at the borough of lirool-ilyn, (-itv of New York, in the county of Kings and State of New York. have invented certain new and useful improvements in .lrocesses of Duplieating lhtmograms. of which the following: is a specification, I

Myinvention relates to improvements in processes of duplicating phonograms of the so-called indestructible type and my objects are the simplification of the processes of manufacture, the cheapening of the cost of production, the use of very thin impressi ble material for the facing if desired, and the production of faced, hacked and imprinted phonograms at one operation if desired.

The accompanying drawing is a sectional view of anapparatus by the aid of which the process may be practiced. I

The process is a modification of the spinning process of duplicating phonograms and the apparatus comprises a frame 1 car ryi'ng a shaft 2 provided with adriving pulv ley 3. The upper end of the shaft carries a base 4 on which a shell 5 which shell may be placed trix 6 having a negative inner face. A cap 7 with 8 covers the top of the while clamp rods 9, 9 hold all the parts to the base. A faucet 10 affords means for injecting centrifugal pressure material to the apparatus.

In practicing the process a film 11 of any impressible material, either in seamless tuseamed tubular form, or sheet form with overlapped edges is inserted in the matrix (it may be temporarily secured in rests and within any desired maphdnogram on its a central aperture shell and matrix fixed relation thereto) and the apparatus is put together as shown. The entire apparatus isthen revolved'at a high rate of speed and any material '12 capable of exciting centrifugal pressure on the impressible film is run into the apparatus and the spinning'continued long enough to imprint the negative matrix into the viously inserted therein thereby producing a positive phonogram. The trapped air between the matrix and the film escapes through the vents 13 during the spinning operationf thereby avoiding bald'or bare spots impressible material pre-= ;any such processes,

Specification of Letters Patent. Application filed August; is, 1909.

in the record. The centrifugal pressure material may be run into the apparatus eitherbefore or during the spinning but in order to form the phonogram the material, film and matrix must be revolved together. By film of impressible substance such as celluloid, xylonite, rubber, gelatin or any like material in solid form, as distinguished from a liquid, c'apable of receiving and retaining the imprint of the matrix either heated state with chemically softened ing.

The material for etlecting-the centrifugal pressure may be one at ordinary temperatures such as water or mercury and which, after the phonogram has been imprinted, may be removed from the appai-atus before the backing is' apsubsequent cooling, or with subsequent hardenplied. ()r it. may be a plastic substance or a semisolid substance which effects the pressure and then solidifies to form the backing, to support the reco'rd film. The internal centrifugal pressure material may be a plug or mandrel inserted within the film of impressible material which plug or mandrel is capable of exerting centrifugal pressure by expansion when spun. The heat when necessary may be applied either externally or the centrifugal pressure material-may be heated so that the heat is applied to the film internally. After the phonogram has been spun and imprinted the cap 7 is removed, the phonogram withdrawn from the matrix and if the backing has been inserted the spinning operation it is reamed to, size and finished. If no backing has been inserted any-suitable backing may be put in thus completing the record.

By this process a much thinner film of impressible material may be used than is possible with heretofore existing processes thus cheapening the cost of production. If the backing is formed inside the phonogram during the spinning the cost still further reduced. 1

I am aware that plastic material has been placed ina-revolving matrix and phonograms in'iprinted directly on such plastic material by centrifugal action and do not claim my invention being confined to Imprinting phonograms on films of impressible materlal by centrifugal action material is meant any 60 in a cold state, or in a 65 which does not solidify 70 during 90 exerted thereon by some material inserted within the film, which material is capable of exerting centrifugal force when spun.

I claim:- I

1. The process of duplicatin phonograms comprising the introduction of a film of 1mpressible material within a matrix, introducing material capable of exerting cen capable of exerting trifugal pressure within the film, revolving the matrix, film and material at a speed suiticient to imprint the matrix in the film by centrifugal action and removing the phonogram thus formed.

2. The process of duplicating phonograms comprising the introduction of a film of impressible material Within a matrix, introducing material capable of exerting centrifugal force within the film, softening the film, revolving the matrix film and material at a speed sufficient to impress the matrix in the softened film by centrifugal action, hardening the film to retain the imprint and removing the phonogram thus formed.

3. The process of duplicatin phonograms comprising the introduction of a film of imgressible material Within a matrix, intro-, ucmg material capable of exerting centrifu al pressure within the film, sald material also being capable of solidifying to form a backin for the phonogram, revolving said matrix, lm and material at a speed. sufiicient to imprint the matrix in the film by centriiz'ugalaction and enough longerto permit the solidifying of the backing in intimate contact with the imprinted film andremoving the record thus formed.

+4, The process of duplicating phonog'rams :;comprising the insertion of a film of imp res sible material Within a matrix, revolv mg film and matrix, introducing material centrifugal pressure within the revolving matrix and film Where- -lution of matrix,

by the matrix is imprinted iii the film by centrifugal action and removing the phonoram.

b 5. The process of duplicating phonograms comprising the insertion of a film of impressible material within a matrix, revolving film and matrix, softening the film, inserting material capable of exerting centrifugal pressure Within the film whereby the matrix is impressed in the film by centrifugal ac tion', hardening the film'to retain the imprint and removing the phonogram.

6. The process of duplicating phonograms comprising the introduction of a film of impressible material Within a matrix, introducing material capable of exerting cen trifugal pressure within the film, revolvin the matrix, film and material at a spec sufficient to imprint the matrix in the film by centrifugal action, removing the pressure material, inserting material'to form--a backing which backing is secured td thefilm by centrifugal action on the continued revofilm and hacking and removing the phonogram.

7 The process of duplicating phonograms comprising the introduction of a film of impressible material Within a matrix, introducing material capable ofexerting centri-fugal pressure Within the film, revolving the matrix, film and material at a speed sufficient to imprint the matrix in the film by centrifugal action, permitting the trapped air between the matrix and film to escape and removing the finished phonogram.

In testimony whereof I have aflixed mysignature in presence of two witnesses.

Rona. B. KILLoonn, F. MCINERNEY. 

